MS-4002
Master Station and Power Supply
The MS-4002 is a complete 4-channel, balanced audio master station and 4-amp system power supply in a single unit. You
simply plug it into any AC power outlet from 100 to 240 volts, add a microphone or headset, connect intercom stations to the
back panel, and you’re ready to communicate. The MS-4002 is now equipped with an Advanced programming Mode on the
front panel, eliminating the need for internal DIP switches. It also has a feature that automatically senses the type of headset
attached to the unit, either dynamic or electret. The MS-4002 ts in a standard 19-inch equipment rack and is 1 rack unit high.
The MS-4002 is Clear-Com compatible, with the ability to run in unbalanced mode.
Auto-Sensing Headset Connector
The MS-4002 has a built-in autosensing headset connec-
tor that will determine automatically whether a dynamic or
electret headset is connected to the system.
Speaker Station or Headset Station
Use the built-in speaker for listening and add an optional
Telex MCP-90 series Gooseneck Panel Microphone for talk-
back. You can also turn off the speaker volume, and plug in a
headset for private communication.
Voice Activated Microphone (VOX)
Separate controls adjust the voice activation level for the
headset microphone and panel microphone inputs.
Public Address (PA) Output, with PA key
Use your intercom microphone to talk over a PA system.
Back-lit Keys
Improves visibility in low-light
Incoming Call Indications
Red ashing call light, with beep tone if desired.
Mic Kill Key
You can turn off all microphones on a channel to quickly
clear the channel.
Program Input for Each Channel
Connect any line-level audio source for monitoring in the
speaker or headset, or for routing to the intercom channel.
The program audio to the channel can be set to interrupt
while the MS-4002 operator is talking on the channel.
Listening with External Powered Speakers
You can connect external powered speakers and then moni-
tor channels 1, 2, 3 and 4.
Expandable
Add more channels by connecting optional EMS-4001
Expansion Stations. Each EMS-4001 adds four additional
powered channels (up to twenty channels).
Instantaneous Auto-Reset
Instantaneous Auto Reset (IAR), the newest technology in
performance and safety, which uses a revolutionary new
circuitry that dynamically monitors line fault conditions. Then,
when the fault is removed, automatically brings individual
power supply channels up.
Clear-Com Compatible
Can run in unbalanced mode.
Features
Line Drawing
MS-4002 Specications
General
Power Requirements:
AC Input: 100-240 VAC, 50/60 Hz
Channel Power: 24 VDC nominal (12 to 30 VDC), 65 to 150
mA
MS-4002 is capable of supplying 4 amps overall
Dimensions: 1.75” (44.5 mm) high, 19” (483 mm) wide,
10.31” (261.9 mm) deep
Weight: approximately 4.5 lb (2 kg)
Environmental Requirements:
Storage: -20°C to 80°C; 0% to 95% humidity, non-condens-
ing
Operating: -15°C to 60°C; 0% to 95% humidity, non-con-
densing
Dynamic-mic Headset
Microphone: 50 to 200 Ω, dynamic (balanced or unbalanced)
Headphones: 150 to 600 Ω, monaural
Connector Type: XLR-4M
Pin 1 Microphone low
Pin 2 Microphone high
Pin 3 Headphone high
Pin 4 Headphone low
Panel Microphone Input
Microphone Type: Electret condenser
Power: Phantom (+5 VDC)
Nominal Level: -42 dBu
Maximum Level: -25 dBu
Connector Type: IKP12 (MCP-90 series, stereo plug connec-
tor)
Program Input
Input Level: 100mV maximum
Voltage Gain: 25 ±3 dB
Output Level (to intercom channel) :1.0 Vrms nominal, 2.3
Vrms max.
Input Impedance: 75 k
Common Mode Rejection: Greater than 50 dB
Connector Type: 9-pin female D-sub (DE9S)
Pin 1 Ground
Pin 2 Program 1 input low
Pin 3 Program 2 input low
Pin 4 NC
Pin 5 NC
Pin 6 Program 1 input high
Pin 7 Program 2 input high
Pin 8 NC
Pin 9 NC
Intercom Channels, Balanced Mode (Both Back Panel and
internal switches (BAL/UNBAL) must be set to same set-
ting)
Output Level: 1 Vrms nominal
Input Impedance: 300 Ω
Bridging Impedance: greater than 10,000 Ω
Sidetone: -40 dB, 35 dB adjustable range
Call Signaling:
Send: 20 kHz ±100 Hz, 0.5 Vrms ±10%
Receive: 20 kHz ±800 Hz, 100 mVrms
Mic-Kill Frequency:
Send: 24 kHz ±300 Hz, 0.5 Vrms ±10%
Detect: 24 kHz ±800 Hz, 100 mVrms
Noise Contribution: less than -70 dB
Common Mode Rejection Ratio: greater than 50 dB
Connector Type: One XLR-3M and XLR-3F pair, wired in paral-
lel, for each channel (permits “loop-thru” connection).
XLR-3 Balanced Conguration Pinouts
Pin 1: Common
Pin 2: Intercom audio low and +24 VDC input
Pin 3: Intercom audio high and +24 VDC input
Intercom Channel, Unbalanced Mode (Both Back Panel
and internal switches (BAL/ UNBAL) have to be set to
same setting)
Output Level: 1 Vrms ±10%
Input Impedance: 150 Ω
Bridging Impedance: greater than 10,000 Ω
Call Signaling:
Send: 11 ±3 VDC
Receive: 4 VDC minimum
Connector Type: Uses same connectors as for balanced mode,
above, but with pinouts modied by BAL/UNBAL switch on
back panel as follows:
XLR-3 Unbalanced Conguration Pinouts
Pin 1: Common
Pin 2: +24 VDC input
Pin 3: Intercom audio high
PA Output
Output Level: 235 mVrms nominal
Connector Type: ⅛-inch Stereo Phone Jack
Tip: PA output high
Ring: Not used
Sleeve: Common
Speaker Output
Output Level: 0 dB nominal (1.0 Vrms)
Output Impedance: 1000 Ω nominal
Frequency Response: 200 Hz to 8 kHz +1/-3dB
Connector Type: RCA Phono Jack
Tip: Speaker output high
Sleeve: Common
Expansion Input /Output
Type: 2.0 mm stereo phone jack
Tip: Talk output
Ring: Listen input
Sleeve: Common
Headphone Amplier
Voltage Gain: 30 ±3 dB
Maximum Output: 250 mW ±10% into 150 Ω, 65 mW ±10%
into 600 Ω
Frequency Response: 200 Hz to 8 kHz +1/-3db
Incoming Call Beep Tone: 2 kHz, at the headphones
Total Harmonic Distortion: Less than 0.2% at 200 mW
Sidetone: 18 ±2 dB, adjustable
Ordering Information
MS-4002
4 channel user/main station with 4.0 amp power sup-
ply
Catalog Number: 90007799000
This specications information is preliminary and is subject to change without notication.
Brand names mentioned are the property of their respective companies.
Contact Information
Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, Minnesota 55337
Telephone: (800) 392-0498
Fax: (800) 323-0498
Form Number: 38110-426B
Date: February, 2006
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